I had mine replaced around 40k. Was making a weird noise. I wouldn't say it's normal, but I also wouldn't say its an indicator of anything going forward. It's a high wear componant on the car.

How exactly did they replace your cylinders?

How many miles do u have on your car since then the replacement? Trying to figure out when/if this expensive repair will ever be needed again under my watch or when to look out for it and sell before that.

I dont see myself keeping this car another 16 months when the warranty is out.